I've had a bit of a poke around the internet and found a few places. Dogtag is one that seems highly recommended on UKRGB and here but it doesn't cover Irish residents anymore it seems, same story with SnowTag..

SportsCoverDirectA quote for the 2 weeks is about 115-160euro depending on what option you choose. Expensive but covers almost anything including search and rescue.

British Mountaineering CouncilQuote was about 90gbp(~110euro). You have to pay to join the BMC (which costs about half that quote) but it means any other trips you take in the next year will be cheaper. Seems to cover everything to a similar amount. Although personal baggage/gear cover is another 25gbp to add on so they work out around the same price..

Both policies seem quite expensive so I'll keep looking and see if I can find a cheaper one. BMC comes pretty highly recommended on UKRGBs forums though so I might lean towards that one.

£30 (sterling) for 20 days cover (with driving time). This covers all grades of kayaking and a bunch of other activities. I added on baggage and equipment cover for a fiver extra then (cameras, passport, etc.).